Improvement in gauge-pins for tympan-sheets



waited tatr @wat @titille R.. W. THING, or BOSTON, MASSACHUSETTS, ASSIGNOR vT0 HIMSELF AND yDAVID T. PRAY, OF( SAM-E PLAGE.

Letters Paam: No. 105,5;8, ma my 19, v1870.

IMPROMVEMENT IN GAUGE-PINS FOR TYMPAN-SHEETS.

The Schedule referred to ln these'Letters Patent and making part of 'che same ence being had to the accompanying drawings making a part of this specilioation, and the letters of reference ymarked thereon, in whichv Figure 1 is plan of my new gauge-pin.

Figure 2 is au edge view of the same.

Figure 3 is a plan ofthe platen of a printing-press, showing the gauge-pills as applied to the tympansheet with a-card resting against them.

Figure 4 is transverse section on line a: x, on fig. 3.

In order to do a good job of printing on a press that'has t-o be` fed by hand, it is necessary to have some sort f `a gauge against which the sheet or card t0 he printed is placed; and by which it is registered accurately with' relation to the form of type.

Herelofore, printers have used apiece of type-metal called quadrat-, or a piece 0f ,Wood denom-inated a "reglet, applied lto the tympan-sheet by means oi' mucilage, gum, or glue.

Gauges applied as above explained are very 0b-` jectonable, on account of the trouble of attachingr them properly vto the tympan-sheet, as, if they are .not placed right in the rst instance, they have to be removed and again gummed or glued on, and if the next form to be printed from happens to be larger than the one just printed f r on1,the tympan-sheet has to be removed and a new one supplied, or the gum remaining on the tympan-sheet would injure the type.

Another objection'to the gauges now in use is that' they are very liable to comeo", as the gum does not hold them so firm but that a slight blow or rap will remove them, and, if left standing over night in cold weather, the frost from the iron ofthe bed or platen to which the tympan-sheet is attached will start them ofi',

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so that they have to' be gummcd on again in the morning. l

To provide a substitute for the old gauges, applied as above stated, that shallobviate the objections above named, is the object of my invention..

My invention consists of a gauge made of metal o r any other suitable material, and provided with one or more pins or prongs to be inserted into the tympansheet, as shown in gs. 3and 4a'Y It also consists in 'giving to lthe pins or prongs a I, curvature upward near the iniddle of their length, as

vshown at a, iig. 2, which serves the purpose of a spring to keep them in place by the friction upon the tympan-sheet, and this curve also serves the purpose of taking up any slack therefmay be in the tympan sheet.

I do not wish to be considered as confining myself 4to the particular fornrrepresented, asrthey may be made oi' various forms wit-houtaffecting the principle.

In the drawings- A is the gauge.. B, the tympan-sheet. v

C, the card lor sheet to be print-cd upon. D is the platen to which the tympan-sheet isab tached.

The gauge-pins are applied to the tympan-sheet as clearly shown in figs. 3 and 4.

Having thus described my invention, That I claim as new, and for which I desire to secure'Letters Patent, is

The within described gauge-pin, whether made with one, two, or more pins or prongs, as a' new article 'of manufacture. 4

Executed at Boston this 17th day of February,

ll. W.' THING.

Witnesses N. G. LOMBARD, FRANK ALLEN. 

